Compressor.



No. 779,385. PATENTED JAN. 3. 1905. W. P. VALENTINE. COMPRESSOR.

APPLIUATION FILED IDEO.8, 1903.

VIII/fillllll UNiTED STATES Patented January 3, 1905.

W ARREN P. VALENTINE, OF WVESTFIELD, NEIV JERSEY.

COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. '279,385, dated January3, 1905.

I Application filed December 8, 1903. Serial No. 184,249.

To a whom it 777/601] concern:

Be it known that I, VVARREN P. VALENTINE, a citizen of the United Statesof America, and a resident of WVestfield, county of Union, State of NewJersey, have invented certain new and useful Improvements inCompressors, of which the following is a specification, reference beinghad to the accompanying drawings, forming a part thereof.

My invention relates to improvements in compressors, and particularly topower-coinpressors operated by internal-combustion motors.

My invention consists in providing a powercompressorcomprising acylinder having the same diameter at both ends and areciprocating pistonfitted thereto, one end of said cylinder constituting a Working chamberand the other end of said cylinder constituting a compression-chamber,with a supplemental exhaustchamber between the cylinder and the pistonand intermediate the working and compression chambers, and in providingthe cylinder with an exhaust-passage communicating with saidexhaust-chamber. By this construction motive fluid escaping past thepiston-head at the working-chamber end will be exhausted into thesupplemental exhaust-chamber and thence through the supplementalexhaust-passage instead of being delivered into the compression-chamberend of the cylinder, and so mixed with the fluid being compressed.

I will now proceed to describe acompressor embodying my invention andwill then point out the novel features in claims.

In the drawings, Figure l is a view in central longitudinal section of acompressor embodying my invention. Fig. 2 is a similar view of certainportions thereof, showing a slightly-modified construction.

In the present embodiment of my invention I have provided a cylinder 1,in which is mounted a reciprocating piston 2. One end of the cylinder 1is adapted to be employed as the working chamber of an internal-c0mbustion motor, such Working chamber designated by the reference character3. The other end of the cylinder is adapted to be employed as acompression-chamber and is designated by the reference character 4. Thecombined motor and compressor will have the usual pistonrod 5,cross-head 6, connecting-rod 7, crankshaft 8, and fly-wheel 9, or partsequivalent thereto, in order to constitute a complete working device.The cylinder'will also be provided withan inlet for motive fluid at itsworking end and an exhaust 1O therefor, and the compression end of thecylinder will be provided with the usual inlet valve or valves and witha discharge for compressed fluid 11. Intermediate the motive-fluidexhaust 10 and the compressed-fluid discharge 11 is arranged asupplemental exhaust 12. This supplemental exhaust is preferably locatedbetween the inner limits of travel of the piston ends, so that it willnever be uncovered by the piston ends to cause it to connect directlywith either the working chamber or the compression-chamber. Preferablythe piston 2 will have a reduced central portion 13, arranged toregister with the said supplemental exhaust.

In operation motive fluid which passes the end of the piston at theworking end of the cylinder will be dischargedthrough the supplementalexhaust 12, and thereby prevented from entering the compression-chamberend of the cylinder.

My improved compressor may be employed for compressing air for purposesother than merely supplying compressed air for the working end of thecylinder, as is common in this type of combined internal-combustionmotor and com prcssor, and by the foregoing construction and arrangementwhich provides for the discharge of motive fluid leaking past the pistonwill deliver compressed air or other fluid in a pure condition and notcontaminated by the working gases, as might easily happen in the absenceof such provision.

In Fig. 2 of the drawings I have shown a slight modification, in whichthe piston is of uniform diameter throughout, but in which the centralportion of the cylinder is chambered out, as at 14:, to receive gasesleaking past the piston from the working end of the cylinder anddischarge them out through the supplemental exhaust 12.

That I claim is 1. In an air-compressor, the combination of a cylinderhaving the same diameterat both ends and a reciprocating piston fittedthereto, one end of the cylinder constituting a working chamber andhaving means for controlling admission and exhaust of motive fluidthereto and therefrom, the other end of said cylinder constitutingacompression-chamber, and having means controlling admission anddischarge thereto and therefrom, said cylinder and piston having betweenthem a supplemental exhaust-chamber, said exhaust-chamberlocatedintermediate said working and compression chambers, and said cylinderprovided with a supplemental exhaust-passage communicating with saidexhaust-chamber.

2. In an air-compressor, the combination of a cylinder having the samediameter at both ends and a reciprocating piston fitted thereto, saidpiston having working heads of equal diameter fitted to the saidcylinder, and having a reduced central portion, one end of the cylinderconstituting a Working chamber and having means for controllingadmission and exhaust of motive fluid thereto and therefrom, the otherend of said cylinder constituting a compression-chamber and having meanscontrolling admission and discharge thereto and therefrom, said cylinderprovided with a supplemental exhaust-passage communicating with thechamber formed by the reduced central portion of said piston.

3. In an air-compressor, the combination of a cylinder having the samediameter at both ends and a reciprocating piston fitted thereto, one endof the cylinder constituting a working chamber and having admission andexhaust ports located at the rear end thereof, the other end of saidcylinder constituting a compression chamber and having inlet anddischarge ports, said cylinder and piston having between them asupplemental exhaustchamber, said chamber located intermediate saidworking and compression chambers, and said cylinder provided with asupplemental exhaust-passage communicating with said eX- haust-chamber.

WARREN P. VALENTINE.

Witnesses: c

D. HOWARD HAYWOOD, O. F. GARRINe'roN.

